Looking for a fish that...
 

1) Is somewhat common and can be found at a pet store(Petsmart, LFS, just nothing too rare)

2) Catfish type thing like an Rubber Lip Pleco or a Loach or whateverm something that doesn't swim but cleans up.

3) Will eat pond snails. They are taking over! :BIGweepy:

4) Won't eat my mystery snails

5) Won't get too big, like under 5 inches.

Kuhlie loaches? Loaches will eat snails, but most are agressive or get large, these guys stay pretty small (long, but thin).

What other fish are in the tank and what size is it?

38 gallons.

Notables: Rubber Lip Plecos, Angelfish, Mystery Snails

I think the khulies should be fine with those fish.

You will have to watch your plec, as he will soon outgrow that tank.

The hard part is not finding a fish that will enjoy your pond snails. Those fish are fairly common. The hard part is one that will not bother the brigs. I have never heard of a fish who is a snail connoisseur who is fond of one snail but wouldn't think of eating another.

They only grow to 5 inches. 8)

Thanks, you're one of the coolest people around here. :P